tibbles



2 Sheets-Sheet 1 (No Mpdel.)

0. TIBBLES. TRBADLE FOR SEWING MAGHINES.

PatentedM-am. 13,1883.

m m M n v 0.3. TIBBLES. 'TREADLIB P0Po SEWING MACHINES. No. 274,058. Patented Manl fi, 1883.

UNITED STATES PATENT ()EEicE.

CHARLES E. TIBBLES, OF BURLINGTON, IOWA, ASSIGNOR TO THE TIBBLES SEWING MACHINE COMPANY, OF SAME PLACE.

TREADLE FOR SEWING-MACHINES.-

SPECIFICATION forming part of Letters Patent No. 274,058, dated March 13,1883.

Application filed December 16, 1882. (No model.) I

' and exact account of the same, reference bein g had to the, accompanying drawings, making part of this specification, in which 7 Figure l is a perspective view of the whole mechanism, the supports being in dotted lines. Fig. 2 is a vertical sectional view of the mechanism. Fig. 3 isa vertical section through the shaft-bearing. Figs. 4 and 5 are details of the treadle-bearing.

Theobject. of my invention is to provide a sewing-machine treadle mechanism and drivin g mechanism in which the lost motion caused by wear can be compensated for, and all the.

journals or bearings be provided with proper guards. I

My invention consists of sundry details of construction and arrangement, as will be hereinafter fully described, and specifically pointed out in the claims.

In order that those skilled in the art may make and use my invention, I will proceed to describe the manner in which I have carried It Out. y I

In the said drawings, A is the frame-work, supporting the treadle and other working parts and shafts, and in it is supported a centrallyarranged four-arm casting, D D D D D. A shaft or rod, B, having bearings in the frame at b b, where it is held stationary by nuts, affords a bearing for the treadle O, which is cast with two side ribs having half-round bearings b b,which rest on said shaft or rod B. Through the top of the half-round bearings in the ribs are out slots 0 in the arc of the circle, andthe said slots have beveled sides, as shown in Fig. 2, and through them pass screws 0, surrounded by blocks or washers 0, having the same bevel as the slots 0'. The screws 0, by means of proper threads, hold the blocks 0 rigidly to the shaft B, and the treadle oscillates back and forth on the shaft, being held in place by the screws and blocks'c. The tapering blocks are made as frusta of pyramids, (see Fig. 5,) and are shorter somewhat than the depth of slots 0, so that the treadle shall bear against their sides only, and the said blocks can be fed down into the beveled slot as the bearing-surfaces wear away. The pitman is connected with the treadle and the crank in any desirable manner. The crank-shaft or driving-shaft F does not extend entirely across the framework, and'has bearings at one end in the frame and at the I other end in the central piece, D, of the fourarm casting or brace. ends of this shaft form an important feature of my invention, and are designed to take'up all lost motion caused by wear. The bearings at each end of shaft are alike, and for illustration I will describe the one in the central frame-piece, D.

Oastwith theframe-picceisasleeve,M,having an interior screw-thread. Into thisis screwed a bushing, K, the interior of which is partially cylindrical and partially conical, (see Fig. 3,) and the tip of the cone cut away into a cylindrical recess, r. This bushing forms the bear- The bearings for the ing in which the crank-shaft turns, the said are turned off, as seen at 0 0, Fig. 3, so as to form a wide shallow groove entirely around the bushing and between it and the sleeve M.

At sundry points around the circumference.

holes 1:: connect the groove 0 with the interior of the bushing or bearing K. On the top of the sleeve M is an opening or hole, a, communicating with the grobve o in bushing K. By

introducing oil through opening or hole at it flows into and fills groove 0, and thence passes through holes 1) p to the interior of bushing K, and lubricates the crankshaft. A jam-nut, 1, around bushing K, serves to fix said bushing in any relation to sleeveM. As the end-thrust bearing of crank-shaft F wears away, the lost motion is taken up by withdrawing, by means of a wrench or other device, the bushings K from their sleeves, so as to properly center the crank. y i v A pan, L, to catch all drip-oil, is screwed at n, by an abutment to the lower side of rod B, and extends toward and beneath the fly-wheel, where it has an enlargement, L, projecting beneath the travel of the pitman-bearings, and has its outer edge, m, bent upward outside of the lower braces of the frame. The pitch of pan L is toward the'point q, so all the Waste oil will collect at that point, which is the most accessible for its removal.

Between the front of the machine, the driving-wheel, and'the bearings, I interpose a solid combined dress-guard and oil-deflecting pan,

G, having in general formation a triangular its lowest point, y, where the drip or wasteoil will be collected in a cup provided for the purpose, or drop upon pan L and be removed at proper intervals. This construction of the guard-plate G insures absoluteimmunity from soiling or entan glin g the dress of the operator. Having thus described my invention, what I claim as new, and desire to secure by Letters Patent, is- V 1. The sewing-machine treadle cast with the beveled slots 0 and the half-round bearings 11, in combination with the tapering blocks 0 and screws 0, for the purpose set forth.

2. The sewing-machine crank-shaft having conical ends and adapted to be operated by treadle G, in combination with the sleeves M, provided with holes n and threaded interiorly, and bushings K, having partially-cylindrical and partially-conical bearing-surfaces, central cylindrical recesses, r, grooves 0, and holes 11, all constructed and arranged substantially as described.

3. The oil-pan C, bolted to rod' B through abutment n, its outer end turned up at m and secured to the lrame, the enlargement L, and standing so as to have a general pitch to at lowest point, q, as specified.

4. The solid imperforate guard-plate G, constructed and secured substantially as set forth.

oHARLEs E. TIBBLES.

Witnesses:

R. K. EVANS, JOHN HANLON. 

